Question 1

A sample of water has a mass of 250 g. Convert this mass to kilograms using the correct SI prefix conversion.

Accepted Answer

$$0.25 	ext{ kg}$$

Question 2

Which of the following is the correct name for the compound $$	ext{Na}_2	ext{CO}_3$$?

Accepted Answer

Sodium carbonate

Question 3

How many significant figures are in the measurement 0.004560?

Accepted Answer

4

Question 4

Which law states that the total mass of reactants equals the total mass of products in a chemical reaction?

Accepted Answer

Law of Conservation of Mass

Question 5

What is the correct formula for the permanganate ion?

Accepted Answer

$$	ext{MnO}_4^-$$

Question 6

A compound contains 12.0 g of carbon and 32.0 g of oxygen. What is the mass ratio of carbon to oxygen?

Accepted Answer

$$0.375$$

Question 7

Which of the following ions has a $$2-$$ charge?

Accepted Answer

Carbonate

Question 8

Balance the following chemical equation: $$	ext{NH}_3 + 	ext{O}_2 ightarrow 	ext{NO} + 	ext{H}_2	ext{O}. $$What is the coefficient for $$	ext{O}_2$$?

Accepted Answer

3

Question 9

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 10

What is the molar mass of $$	ext{Ca(NO}_3)_2$$?

Accepted Answer

$$164 	ext{ g/mol}$$

Question 11

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of $$	ext{CO}_2$$. How many moles of $$	ext{CO}_2$$ are present?

Accepted Answer

$$0.5 	ext{ mol}$$

Question 12

Which of the following is a binary covalent compound?

Accepted Answer

$$	ext{CO}_2$$

Question 13

What is the correct name for $$	ext{ClO}_3^-$$?

Accepted Answer

Chlorate

Question 14

How many protons are in an atom of $$^{23}	ext{Na}$$?

Accepted Answer

11

Question 15

Which of the following is NOT a metal?

Accepted Answer

Chlorine

Question 16

A student measures the length of a desk as 1.250 m. How many significant figures are in this measurement?

Accepted Answer

4

Question 17

Which of the following ions is polyatomic and has a $$3-$$ charge?

Accepted Answer

Phosphate

Question 18

A hospital uses a saline solution containing $$0.90\%$$ NaCl by mass. If a patient receives $$500 	ext{ mL} of $$solution (density $$1.00 	ext{ g/mL}$$), how many grams of NaCl does the patient receive?

Accepted Answer

$$4.50 	ext{ g}$$

Question 19

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$(	ext{NH}_4)_2	ext{SO}_4$$

Question 20

A chemist needs to prepare $$250 	ext{ mL} of a$$ $$0.10 	ext{ M}$$ $$	ext{NaCl}$$ solution. How many grams of $$	ext{NaCl}$$ are required? ($$	ext{Molar mass of NaCl} = 58.44 	ext{ g/mol})$$

Accepted Answer

$$1.46 	ext{ g}$$

General Chemistry Fundamentals: Units, Nomenclature, and Chemical Calculations

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